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Prestorage conditioning, diphenylamine improve condition of 'honeycrisp' apple

Date:
March 26, 2014
Source:
American Society for Horticultural Science
Summary:
Experiments with 'honeycrisp' apples investigated susceptibility to controlled-atmosphere injury, determined the influence of O2 and CO2, and evaluated options for avoiding injury during controlled-atmosphere (CA) storage. Injury severity declined as the temperature of the prestorage conditioning period increased. Diphenylamine also provided nearly complete control of CA injury. 1-MCP, although not studied in conjunction with a modified atmosphere, caused no injury in air storage and thus may provide an alternative to CA storage for honeycrisp.

Since the introduction of 'Honeycrisp' apples in 1991, the variety has become a consumer favorite for its unusual texture and delicious flavor. Honeycrisp has increased in popularity with growers as well; Michigan, New York, and Washington boast significant numbers of 'Honeycrisp' orchards. As the growing area dedicated to the variety has grown, the need to find better methods for improving storage performance has become more important to growers. Because 'Honeycrisp' is very sensitive to low temperatures and can be damaged by controlled-atmosphere conditions, long-term storage of the apples can be challenging.

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Carolina Contreras and Randy Beaudry from the Department of Horticulture at Michigan State University and Nihad Alsmairat from the Department of Horticulture and Crop Science at the University of Jordan published a study in HortScience that revealed some important information for apple producers. "Our work was conducted in two phases," Beaudry explained. "The first phase was designed to determine whether 'Honeycrisp' apples were susceptible to controlled-atmosphere injury, to determine the relative influence of O2 and CO2, and to identify a treatment combination that would reliably generate symptoms so that control measures could be subsequently evaluated." In the second phase, the scientists evaluated options for avoiding injury to 'Honeycrisp' during controlled-atmosphere storage. Fruit were conditioned at 3 C, 10 C, and 20 C for 5 days and then exposed to one of nine different storage treatments.

In the first experiment, 'Honeycrisp' exhibited a high sensitivity to both low oxygen and elevated CO2 levels. "We found that the controlled-atmospheres used induced injuries typical of those associated with CO2 (i.e., small brown lesions and associated lens-shaped cavities) and also larger dark brown lesions with often irregular margins," the authors said. "The extent of the injury was higher for those fruit in an atmosphere with elevated CO2 for each level of O2."

Subsequent experiments took place over 3 years, during which the researchers reproduced the controlled-atmosphere (CA) injury from the preliminary study with varied intensity. Although the researchers observed high variability between orchards and years, they found two treatments that effectively controlled the CA injury. "We found that the brown lesions in the cortex were completely suppressed by DPA application, even when the prestorage conditioning temperature was 3 C," Beaudry said. "The incidence of cavities ranged from 0.1% to 0.3% under the same DPA treatment. On the other hand, the most affected treatment was 3/3 followed by 3/0, 21/0, and 21/ 0 plus 1-MCP."

The authors noted that, while there is good progress toward determining optimal storage recommendations for 'Honeycrisp' additional studies are still warranted. "For instance, although the 7-day prestorage conditioning treatments provided some protection against the development of CA injury, shorter durations should be investigated to prevent quality loss resulting from excessive ripening, which could cause increased skin greasiness and undesirable flavor profile."

The study includes additional recommendations for handling 'Honeycrisp' in prestorage conditions.

The complete study and abstract are available on the ASHS HortScience electronic journal web site: http://hortsci.ashspublications.org/content/49/1/76.abstract


Story Source:

The above story is based on materials provided by American Society for Horticultural Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Carolina Contreras, Mi Nihad Alsmairat, Randy Beaudry. Prestorage Conditioning and Diphenylamine Improve Resistance to Controlled-atmosphere-related Injury in ‘Honeycrisp’ Apples. HortScience, March 2014

Cite This Page:

American Society for Horticultural Science. "Prestorage conditioning, diphenylamine improve condition of 'honeycrisp' apple." ScienceDaily. ScienceDaily, 26 March 2014. <www.sciencedaily.com/releases/2014/03/140326153755.htm>.
American Society for Horticultural Science. (2014, March 26). Prestorage conditioning, diphenylamine improve condition of 'honeycrisp' apple. ScienceDaily. Retrieved November 26, 2014 from www.sciencedaily.com/releases/2014/03/140326153755.htm
American Society for Horticultural Science. "Prestorage conditioning, diphenylamine improve condition of 'honeycrisp' apple." ScienceDaily. www.sciencedaily.com/releases/2014/03/140326153755.htm (accessed November 26, 2014).

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